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Tytuł:
Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen
Autorzy:
Martins Jr, J. R. S.
Araújo, R. O.
Nogueira, R. A.
Grandini, C. R.
Powiązania:
https://bibliotekanauki.pl/articles/351840.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical spectroscopy
anelasticity
internal friction
Ti-Mo alloys
interstitials
biomaterials
Opis:
Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 25-30
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Case Hardened AISI 4130 Steel Using Eddy Current Testing
Autorzy:
Gukendran, R.
Parameshwaran, R.
Ponappa, K.
Powiązania:
https://bibliotekanauki.pl/articles/351982.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 4130
casting defects
annealing
hardness
eddy current testing
Opis:
Casting is the manufacturing process of pouring the hot liquiduos state metal in to the mold cavity and then allowed it to solidify to obtain the final casting. There are many defects are found in the casting components during the inspection. Some defects are tolerated while others are required to repair. Otherwise the casting component is to be eliminated due to the poor quality level. The aim of the non-destructive inspection is to determine, the flaws, discontinuities on the material, and characteristics of the material. Based on the results by non-destructive evaluation the personnel take the decision on the material object is to be accepted or not as per the criteria. In this paper the hardness attribute of the case hardened AISI 4130 steel samples are studied using Vickers Hardness test. Then the hardness property is correlated with the Eddy Current Testing method. According to the acceptance criterion the suitability of the material is analyzed for the corresponding application or not. In this paper Eddy Current Testing response is analyzed for the AISI 4130 samples to determine the mechanical properties of the material. The main objective of the paper is to investigate the effect of the hardness property of the casting material during various case depth obtained via case hardening process. This technique is effective and best practice for the heat treatment shop floors. By this technique the results are investigated based on the cracks and microstructure of the casting material.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1833-1837
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemically Modified Cellulose Capped Zinc Oxide Nanocomposite: Spectral and Optical Properties
Autorzy:
Jagadeeswari, R.
Selvakumar, P.
Jeevanantham, V.
Saravanan, R.
Powiązania:
https://bibliotekanauki.pl/articles/2049414.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chemically modified cellulose
hydrothermal
XRD
surface morphology
effective mass approximation
Opis:
In this study, a new chemically modified cellulose polymer-capped ZnO nanopowder prepared by hydrothermal method using chemically modified cellulose polymer as capping agent was successfully reported. The structural characteristics of CMC-capped ZnO nanopowder was reported by FTIR, XRD, SEM and EDX studies. XRD results revealed crystallographic properties like crystal composition, phase purity and crystallite size of the prepared CMC-capped ZnO nanopowder and average size calculated by Debye Scherrer formula as 14.66 nm. EDX studies revealed that the presence of elemental compositions of capping agent in the nanopowder samples. The optical characterization of the CMC-capped ZnO nanopowder was studied using UV absorption (λ max = 303 nm) and PL spectroscopy (λ ex = 295 nm). The average crystal diameter and grain size were calculated by effective mass approximation formula and compared with XRD findings that agreed well and verified CMC capped ZnO with particle size of 193 nm. Thus, the promising optical characteristics shown by the synthesized CMC capped ZnO nanopowders exposes its potential usage in bio-medical fields.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 911-915
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cutting Fluid Flow Rate and Cutting Parameters on the Surface Roughness and Flank Wear of TiAlN Coated Tool in Turning AISI 1015 Steel Using Taguchi Method
Autorzy:
Moganapriya, C.
Rajasekar, R.
Ponappa, K.
Venkatesh, R.
Karthick, R.
Powiązania:
https://bibliotekanauki.pl/articles/356195.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TiAlN coated inserts
surface roughness
flank wear
Taguchi method
ANOVA
Opis:
This paper presents the influence of cutting parameters (Depth of cut, feed rate, spindle speed and cutting fluid flow rate) on the surface roughness and flank wear of physical vapor deposition (PVD) Cathodic arc evaporation coated TiAlN tungsten carbide cutting tool insert during CNC turning of AISI 1015 mild steel. Analysis of Variance has been applied to determine the critical influence of cutting parameters. Taguchi orthogonal test design has been employed to optimize the process parameters affecting surface roughness and tool wear. Depth of cut was found to be the most dominant factor contributing to high surface roughness (67.5%) of the inserts. However, cutting speed, feed rate and flow rate of cutting fluid showed minimal contribution to surface roughness. On the other hand, cutting speed (45.6%) and flow rate of cutting fluid (23%) were the dominant factors influencing tool wear. The optimum cutting conditions for desired surface roughness constitutes the following parameters such as medium cutting speed, low feed rate, low depth of cut and high cutting fluid flow rate. Minimal tool wear was achieved for the following process parameters such as low cutting speed, low feed rate, medium depth of cut and high cutting fluid flow rate.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1827-1832
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Multicomponent PZT-Type Ceramics for Micromechatronic Applications
Autorzy:
Bochenek, D.
Niemiec, P.
Adamczyk, M.
Skulski, R.
Zachariasz, R.
Wodecka-Duś, B.
Machnik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353571.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multicomponent PZT-type ceramics
piezoelectrics
micromechatronics
actuators
Opis:
In the paper two compositions of the multi-component PZT-type ceramics admixtures by Mn4+, Sb3+, W6+, Ni6+ were presented. The ceramic powders were synthesized by the calcination of powders while their densification was carried out by free sintering method. The dielectric, ferroelectric, piezoelectric studies and DC electrical conductivity of the multicomponent PZT-type samples were presented. The results of the multi-component ceramics predispose these type materials in micromechatronic and microelectronic applications for example as element of the actuators.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 667-672
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review on Parameters Influencing the Rice Breakage and Rubber Roll Wear in Sheller
Autorzy:
Prabhakaran, P.
Ranganathan, R.
Muthu Kumar, V.
Rajasekar, R.
Devakumar, L.
Pal, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/351700.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rice
rice breakage
rubber roll sheller
Opis:
The present review deals with parameters influencing the rice breakage during rice milling operations and the effect of rubber roll Sheller in rice husk removal process. The main objective of rice milling system is to remove the husk and bran layer to produce the white rice. In this process, rubber roll sheller is used to remove husk from the grains by friction process. If the rubber material is too soft, there may not be sufficient shear force to husk the paddy. Wear will be minimum for rubber material with high hardness but indeed it pronounce the breakage of rice. Hence, for efficient husking the rubber roll material should possess the balance of physico-mechanical properties. Rice breakage depends on several other parameters like the type of harvest, drying temperature, drying methods, physical characteristics of paddy, husking characteristics, paddy moisture content, rubber roller speed, rubber roll pressure, paddy feed rate and fissures. Rubber roll wear depends on the type of rubber material attached to the roller, feed rate, roller speed, pressure etc.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1875-1880
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of surface modification methods for ReligaHeart® cardiac support system
Autorzy:
Major, R.
Kustosz, R.
Trembecka-Wójciga, K.
Lackner, J. M.
Major, B.
Powiązania:
https://bibliotekanauki.pl/articles/352605.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ReligaHeart® cardiac support system
pneumatic heart
blood-polymer barrier
proangiogenic effect
Opis:
The work is a review of the methods of the surface modification performed by the authors dedicated for for cardiac support system. It presents the evolution of designing the surface dedicated to direct contact with blood. Initially thin and ultrathin coatings were developed. They were designed as a blood-polymer barrier. The pneumatic heart assist devices are made of a medical grade polyurethane. A major milestone was to create advanced ceramic thin films expressing the flexible effects deposited by physical techniques. Coatings have evolved. Another milestone was the surface reproducing the microenvironment to capture progenitor cells from the bloodstream. Thin coatings were prepared, using methods of ion been, controlled residual stresses were introduced. Wrinkles appeared without cracking. This enabled taking control over the process of cell differentiation. Alternatively, the tissue inspired structure resulted of the coating in the form of extracellular matrix. The outer surface was modified with synthetic materials. This enabled the effective proteins docking to induce cell growth, recreating the luminal side of the blood vessel. Coagulation processes have been slowed down. In addition, it was found pro-angiogenic effect.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1399-1404
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Microstructure in High Temperature Tribology of Iron Alloys
Autorzy:
Krawczyk, J.
Rożniata, E.
Zimowski, S.
Kot, M.
Dąbrowski, R.
Dziurka, R.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/355366.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
tribology
iron alloys
cast steel
wear
cementite
Opis:
The present paper describe the issue of tool materials wear in a high temperature conditions. The investigations were performed at the cast steel tool material at the tribological contact to the structural steel. The investigations aim was to determine the role of microstructure in a tribological properties between the structural steel and tool material. The results of such investigation could be referenced to the industry conditions and could answer about the problems of tool materials wear. The observations of the wear mechanisms were referred to the microstructure of the mill rolls. The laboratory tests ware aimed at evaluating the thermal treatment modification effect on the cast steels properties. A significant role of the morphology of ledeburitic cementite and secondary cementite on the tribological properties was exhibited. The investigations assumed the presence of an austenitic matrix with primary and secondary cementite. Influence of varying morphology carbides was described. in the cast steel microstructure. The investigation results make possible to point to a direction of carbide morphology change with the purpose of obtaining the assumed properties of hot operation tools.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 915-920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Oscillation Parameters on Surface Quality of Cast Billets
Autorzy:
Cibulka, J.
Krzok, R.
Hermann, R.
Bocek, D.
Cupek, J.
Michalek, K.
Powiązania:
https://bibliotekanauki.pl/articles/351593.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting of steel
mould oscillations
peritectic steel grades
billet surface quality
Opis:
The paper is focused on impact of different oscillation parameters on surface quality of peritectic steel grades cast into billets 150x150 mm. Hydraulic oscillation used for this purpose was temporarily installed on one strand of the billet caster. Hydraulic oscillation enables, in comparison to ordinary used electromechanical oscillation, flexible set-up of basic parameters of the oscillation cycle (negative strip time and its ratio). Proper oscillation mode is capable to assure regular oscillation marks development, good lubrication in the mould and adequate compression of the solidifying shell. Impact of an oscillation mode providing negative strip time 0.085 s and its ratio -50 % on surface quality of cast billets is compared with standard oscillation mode applied on strands equipped with electromechanical oscillation characterized with variable negative strip time between 0.084 and 0.096 s and fixed negative strip ratio to -14 %.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 283-288
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Mn in Aluminium Alloys with a Higher Iron Content
Autorzy:
Bolibruchová, D.
Podprocká, R.
Pastirčák, R.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/355687.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AlSi7Mg0.3
β-Al5FeSi phase
manganese
thermal analysis
Opis:
The paper deals with the influence of manganese in AlSi7Mg0.3 alloy with higher iron content. Main aim is to eliminate harmful effect of intermetallic – iron based phases. Manganese in an alloy having an iron content of about 0.7 wt. % was graded at levels from 0.3 to 1.4 wt. %. In the paper, the effect of manganese is evaluated with respect to the resulting mechanical properties, also after the heat treatment (T6). Morphology of the excluded intermetallic phases and the character of the crystallisation of the alloy was also evaluated. From the obtained results it can be concluded that the increasing level of manganese in the alloy leads to an increase in the temperature of the β-Al5FeSi phase formation and therefore its elimination. Reducing the amount of β-Al5FeSi phase in the structure results in an improvement of the mechanical properties (observed at levels of 0.3 to 0.8 wt. % Mn). The highest addition of Mn (1.4 wt.%) leads to a decrease in the temperature corresponding to the formation of eutectic silicon, which has a positive influence on the structure, but at the same time the negative sludge particles were also present.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1883-1888
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significant alloy elements in welded steel structures of car body
Ważniejsze pierwiastki stopowe w spawanych stalowych konstrukcjach pojazdów
Autorzy:
Węgrzyn, R.
Wieszała, R.
Powiązania:
https://bibliotekanauki.pl/articles/354889.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pierwiastki stopowe
spawanie
wytrzymałość
badanie zmęczeniowe
alloy elements
weld
impact toughness
fatigue test
Opis:
Structure, safety and exploitation conditions of welding steel in car body depend on many factors. The main role of that conditions is connected with car body material, welding technology, state of stress and temperature. Because of that, a good selection of steel and welding method is very important for proper steel structure. Low alloy steel is used for car body structure, very often with small amount of carbon and the amount of alloy elements such as Ni, Mn, Mo, Cr and V in car body and welded joints. Depending on the kind of steel which is used, a proper welding method and adequate filler materials should be applied. The present paper describes the influence of Mn, Ni, Mo, Cr, V in WMD (Weld Metal Deposit) on the behaviour of steel structure especially for low temperature service.
Struktura, bezpieczeństwo i warunki spawania stali karoserii samochodowych są zależne od wielu czynników. Główną rolę odgrywają warunki związane z materiałem, metodą spawania, stanem naprężenia oraz temperaturą. Jednakże za najistotniejszy czynnik uważany jest odpowiedni dobór metody spawania. Do konstrukcji karoserii używana jest stal niskostopowa, bardzo często z małą ilością węgla i pierwiastków stopowych, takich jak Ni, Mn, Mo, ??Cr i V. W zależności od rodzaju stali należy użyć właściwej metody spawania oraz odpowiednich materiałów dodatkowych. W niniejszej pracy przedstawiono wyniki badań wpływu Mn, Ni, Mo, Cr, V w stopiwie (WMD) na zachowanie konstrukcji stalowej szczególnie podczas niskich temperatur pracy.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 1; 45-52
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocomposites graphene/CoFe2O4 and graphene/NiFe2O4 – preparation and characterization
Autorzy:
Jędrzejewska, A.
Sibera, D.
Pełech, R.
Jedrzejewski, R.
Narkiewicz, U.
Powiązania:
https://bibliotekanauki.pl/articles/352113.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
graphene
nanocomposites
CoFe2O4
NiFe2O4
Opis:
A series of nanocomposite graphene/CoFe2 O4 and graphene/NiFe2 O4 hybrid materials was synthesized via facile, one-pot solvothermal route. The materials were obtained using two pressure methods: synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The use of a microwave reactor enabled to significantly shorten the synthesis time up to 15 min. All the syntheses were carried out in a solution of ethanol. The effect of processing conditions and composite composition on the physicochemical properties and electric conductivity was studied. The specific surface area, density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated. The results of studies of composites obtained in an autoclave and in a microwave reactor were compared.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 103-112
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Corrosion Performance of Carbon Steel Coated with Iron Aluminide in Mixture of O2 and SO2 Atmosphere
Autorzy:
Omranian-Mohammadi, P.
Raiszadeh, R.
Shahverdi, H. R.
Powiązania:
https://bibliotekanauki.pl/articles/352419.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iron aluminide
high temperature corrosion
plain carbon steel
Opis:
In this investigation the surface of an aluminized sample of plain carbon steel was melted and alloyed using a tingsten inert gas (TIG) welding process to produce iron-aluminide intermetallic phases on the surface. The produced coating was then characterized by SEM and EDS and its high-temperature properties in O2 + 1%SO2 gas were examined. The results showed that the Fe3 Al coating produced could protect the substrate as it was subjected to the corroding gases at 700°C due to the formation of an alumina layer between the substrate and an outer layer of Fe2 O3 . At 900°C, the coating could only protect the substrate for 64 h. The lack of further protection at this temperature is attributed to the decrease in the protective properties of alumina with an increase in its temperature and the lack of presence of enough Al atoms in the coating for the repair of the defects formed in the alumina layer.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 529-538
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model investigations on slag entrainment in continuous casting
Modelowe badania zaciągania zasypki krystalizatorowej w procesie ciągłego odlewania
Autorzy:
Scheller, P. R.
Hagemann, R.
Powiązania:
https://bibliotekanauki.pl/articles/354608.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
odlewanie ciągłe
zasypka krystalizatorowa
emulsyfikacja
kropelki żużla
continuous casting
slag entrainment
emulsification
slag droplets
Opis:
Today continuous casting is the state of the art in industrial casting processes. The casting powder used fulfill various tasks such as preventing air contact, absorbing non-metallic inclusions from liquid steel, providing lubrication between strand shell and mould wall and controlling heat transfer. The mould powder in contact with liquid steel surface forms a liquid slag layer. The jet of liquid steel from submerged entry nozzle is reflected at the mould wall forming a lower and upper flow pattern. The upper flow moves along the steel-slag interface and generates shear stress at the interface and waves. Viscosity- and density-differences between the two liquid phases leads under certain flow conditions to finger like protrusions. Reaching a critical flow velocity the protrusions can breakup and form slag droplets following the flow into the liquid steel-pool. These droplets can form finally non-metallic inclusions in steel material, cause defects in the final product and therefore should be avoided. Till now the physical mechanisms of slag entrainment are not completely understood. The interaction at the liquid-liquid interface was investigated using cold model study using a single-roller driven flow in oil-water systems with various silicon oil properties. The critical values of the dimension free capillary number Ca for droplet breakup marking the start of their entrainment in the lower fluid are determined over a wide-range of fluid properties defined as the product of viscosity ratio (dispersed liquid/continuous liquid) and density ratio (continuous liquid/dispersed liquid) ?. With the knowledge of thermo-physical properties of steel-slag systems the critical capillary number Ca* for slag entrainment as a function of Λ could be derived. Assuming stable conditions at the interface and no reaction between the phases no slag entrainment should occur under usual casting conditions.
Obecnie ciągłe odlewanie jest najnowocześniejszą metodą w przemysłowych procesach odlewania. Zasypka krystalizatorowa stosowana w procesie spełnia różne zadania takie jak: ochrona przed atmosferą powietrza, absorpcja wtrąceń niemetalicznych z ciekłej stali, zapewnienie smarowania między powierzchnią pasma a krystalizatorem oraz kontrola wymiany ciepła. W kontakcie z powierzchnią ciekłej stali zasypka tworzy warstwę ciekłego żużla. Strumień ciekłej stali z wylewu zanurzeniowego jest odbijany od ściany krystalizatora formując zróżnicowane natężenia przepływu. Wyższy przepływ stali wzdłuż powierzchni żużla generuje naprężenia ścinające na powierzchni rozdziału faz oraz jej falowanie. Różnice lepkości i gęstości pomiędzy dwiema ciekłymi fazami prowadzą pod pewnymi warunkami przepływu do powstania wypukłości. Osiągnięcie krytycznej prędkości przepływu może powodować odrywanie wypukłości i formowanie kropelek żużla przepływających do ciekłej kąpieli metalowej. Kropelki te tworzą wtrącenia niemetaliczne w stali, powodując wady w końcowym produkcie, zatem powinno sie dążyć do ograniczenia ich powstawania. Do tej pory fizyczne mechanizmy zaciągania żużla nie zostały dokładnie poznane. Oddziaływanie na granicy ciecz-ciecz zostało zbadane przy użyciu zimnych modeli z pojedynczą rolką napędzającą w układzie olej-woda, przy użyciu olejów silikonowych o różnych właściwościach. Krytyczna wartość liczby kapilarnej Ca dla rozdrobnienia wskazującego początek zaciągania przy niskim przepływie została wyznaczana dla szerokiego zakresu właściwości na podstawie współczynników lepkości (płyn zdyspergowany/płyn ciągły) i gęstości (płyn ciągły/płyn zdyspergowany) ?. Znając właściwości termofizyczne układu stal-żużel można wyprowadzić krytyczną liczbę kapilarną Ca* dla zaciągania żużla jako funkcję Λ. Zakładając stabilne warunki na powierzchni międzyfazowej oraz brak reakcji między fazami, w zwykłych warunkach ciągłego odlewania nie powinno następować zaciąganie żużla.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 1; 283-289
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation of Microstructure, Mechanical and Wear Characteristics of Cu-Ni/ZrC Composites Synthesized through Friction Stir Processing
Autorzy:
Velmurugan, T.
Subramanian, R.
Priyadharshini, G. Suganya
Raghu, R.
Powiązania:
https://bibliotekanauki.pl/articles/351128.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-Ni/ZrC composite
Friction Stir Processing
mechanical properties
wear
Opis:
Friction Stir Process (FSP) was employed to develop Cupro-Nickel/Zirconium Carbide (Cu-Ni/ZrC) surface composites. Five different groove widths ranging from 0 to 1.4 mm were made in CuNi alloy plate to incorporate different ZrC volume fraction (0, 6, 12, 18 and 24 %) to study its influence on the structure and properties of Cu-Ni/ZrC composite. Processing was performed at a Tool Rotational Speed (TRS) of 1300 rpm, Tool Traverse Speed (TTS) of 40 mm/min with a constant axial load of 6 KN. The study is performed to analyse the influence of ZrC particles and the volume fraction of ZrC particles on the microstructural evolution, microhardness, mechanical properties, and tribological characteristics of the Cu-Ni/ZrC composite. The fracture and worn-out surfaces are analysed using Field Emission Scanning Electron Microscope (FESEM) to identify the fracture and wear mechanisms. The results demonstrated a simultaneous increase in microhardness and tensile strength of the developed composite because of grain refinement, uniform dispersion, and excellent bonding of ZrC with the matrix. Besides, the wear resistance increases with increase in volume fraction of ZrC particles in the composite. The surface morphology analysis revealed that the wear mechanism transits from severe wear regime to mild wear regime with increase in volume fraction of ZrC particles.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 565-574
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 404

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